Amplifying horn



Jline 23, 1931. F. w. TEMPLE 1,811,598

AMPUIFYING HORN Original Filed Aug. l, 1927 5 Sheets-Sheet l June 23, 1931. F. w. Tl-:MFLE 1,811,598

AMPLIFYING HORN Original Filed Aug. 1, 1927 5 Sheets-Sheet 2 O f O if June 23, 1931. F. w. TEMPLE 1,811,598

' AMPLIFYING HORN Original Filed Aug. 1, 1927 5 Sheets-Sheet 3 M@ fz@ y June 23, 1931'. F, w, TEMPLE 1,811,598

AMPLEKFYING HORN 5 Sheets-Sheet 4 Original Fied Aug. 1, 1927 F. w. TEMP| E 1,811,598

AMPLIFYING HORN June 23, 1931.

1927 5 Sheets-Sheet 5 I Original Filed Aug. l,

'il i Patented June 2 3, 1.931

UNITED STATES PATENT oFF-ICE FRED W. TEMPLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO TEMPLE, INC., OF CHICAGO, ILLINOIS, A ,CORPORATION OF ILLINOIS AMPLLFYING HORN Original yapplication led Aug-ust `1, 1927, Serial No. 209,730. Divided and this application led November My invention relates to amplifying horns and more particularly to amplifying horns adapted to be employed in connection With `radio receiving apparatus or the like.

.A particular .object of the invention is to provide devices of .the kind described that are neat and Yattractive .in appearance, com

pact, efficient and .satisfactory for use vvher` ever found applicable.

sembled.

Still another particular object of the invention is to provide an improved amplifyl ing .horn which Will amplify the sounds received from a yreceiving unit for distribution thereof.

Many other objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from `the disclosure herein given. Tothis end my invention consists in th novel construction, arrangement and combinationof yparts herein shown and described,

and more particularly pointed out in the claims. I l

In the drawings, wherein like reference characters yindicate like or corresponding parts.;

which I ,preferably `employ inconnection with the flexible core `shovvn in Fig. 1;

Fig. 8 .is an elevation of theflexible core shown in Fig. 1, 4the helical spring illust-ratedl in 2 being shown Wrapped around the -core Fig. 4 Ais a plan elevation of ypart of my improved molding apparatus, one of the molding `members 'which closes the ltop of the mold cavity during the molding operation lbeing-ounitted .from the dra-Wings;

Fig. 5 is a section taken substantially on Serial No. 234,486.

line 5 5 of Fig. 4 but in this instance,` the upper molding member is shown in place to close the upper end of the mold cavity;

Fig. 6. is a rear elevation of my improved amplifying horn as it appears before the base is attached thereto and before the rear end is closed by a cover plate;

Fig. 7 is a front elevation of my improved amplifying horn as it appears before the front end is closed by a fabric or foraminous member and before the reproducing unit and 'the base are attached to the horn;

Fig. 8 is `a section taken on line 8 8 of Fig. 6;

Fig. 9 is a section taken on line 9 9 of Fig. 6; v

Fig. 1() isa front elevation of my improved amplifying horn;

Fig. 11 is a side elevation of my improved amplifying horn;

Fig. 12, is an enlarged fragmentary section taken on line 12 12 of Fig. fi;

Fig. 13 is an enlarged fragmentary section taken on line l13 13 of Fig. 10;

F ig. 14 is a section taken on line 14 14 i of Fig. 13; and

Fig. 15 is a central longitudinal section taken through a nipple or insert Which is `preferably embedded in the molded part of each horn to hold the receiving unit.

This application is a division of my copending application S. N. 209,7 30,-f1led August 1, 1927.

Referring for the present to Figs. 8 to 15 inclusive, wherein I have illustrated cerif: tain details'of` construction of my improved amplifying horn, it Will bernoted that .the`

horn preferably comprises a substantially cylindrical bodyportion 2O Which is mounted upon a suitable base 21. The body porif tion 20 preferably comprises a shell or housing member 22 which, in the preferred embodiments `of the invention, is preferably.`

grooves 24. The annular grooves 24 and 25 form annular shoulders and insure that a molded body 27 disposed within the housing 22 will not be accidentally displaced therefrom as portions of the molded body 27 project into the grooves. It will be noted that when the annular groove 25 is formed in the inner surface of the housing member 22, an outwardly projecting annular portion 2G is simultaneously formed upon the exterior surface of the housing member 22. The annular portion 26 preferably conforms to the shape of a substantially V-shaped groove 3() formed in an arcuate saddle 31 upon which the housing member 22 is mounted (see Fig. 11). The saddle 31 is preferably clamped between the housing member 22 an-d the base 21. Thus, a nut 32, or the equivalent, embedded in the molded body 27 engaged by a bolf; 3d, or the equivalent, the head of which engages the base 21 (see Fie'. 13). The shank of the bolt B/l preferably extends through suitable apertures formed in the base 21 and in the saddle 31 and through a suitable aperture 35 formed in the housing member 22. `he shank of the bolt 34 also project-s through a washer 37 which is also preferably embedded in the molded body 27. r he construction is such that the bolt 34 cooperates with the nut 32 to rigidly secure the body portion 20 and the saddle 31 to the base 21.

The front end of the housing member 22 is preferably covered with a closure member or end device 38 which preferably comprises an annular member o9 engageable with the housing' member 22 and a foraminous member l() which is carried by the annular member 39. The other end of the housing member 22 is preferably closed by a sheet metal cover 42.

Referring to Figs. Sand 9, it will be noted that the. molded body 27 is provided with a more or less helically or spirally arranged tapering sound passage d5. As best shown in Fig. 7, the outer or discharge end of tie sound passage l5 is relatively large and, by referring to the other figures, it will be noted that the sound passage gradually diminishes in diameter or cross-sectional. area from the discharge end thereof to the other end there of and that the latter end communicates with a tubular nipple 47 which is embedded in the molded body 27. As best shown in Figs. 9 and 15, the nipple 47 is provided, at its inner end, with a bore Li8 which is preferably of the same diameter as the smaller end of the sound passage 45, the bore 48 being concentrically arranged with a bore 4-.9 of larger diameter which is formed in the outer end of the nipple and forms an enlarged continuation of the bore 4S. The bore Li9 is preferably screw-threaded so that a reproducing` unit 52 of the type commonly emploiV amplifying horns, or the equivalent, mai.7

,ses

be secured to the nipple. A foraminous member or screen 53, or the equi aient, preferably rests upon an annular shoulder if: formed between the bores and i-9 and is held in place thereon by the reproducing unit 52. This screen prevents dust, or the like7 from drifting into the reproducing unit. As shown, the nipple 47 is preferably provided with integral lugs or fingers .57 which ai-u arranged concentrically around the bore e8 and project into the molded body 27 to prevent accidental displacement of the nipple rmative there' o. notlier function 0f the lugs or lin rs 57 will presently appear.

As illustrated in Figs. 8 and 9, a relatively small amount of molding material is employed to ferm the molded body 27, the a r rangement being such that a wall 59 of suitable thickness is provi-:lcd around the sound passage throughout its length and a web GO of molding material extends between the turns of the pasrisage. flilmbedded in the wall 59 of the passage are one or more helical springs (S2 which lie in close proxiinity to the passage 45 and incidentally serve to reinforce the wall. The primary 'function of the spring or springzjs 62 is not to reinforce the structure but is rather to serve as spacing means for a flexible core Gil during the casting or molding operation.

The flexible core 6l is best shown in Fig. l and is preferably formed of a high grade glue comprising gelatine. Of course, th core G4. conforms to the shape of the sound passage l5, the core being tap-ered from om` end thereof to the other end thereof. ,lit will noted that at its larger end, the core Gil is provided with a recess (S6 and with an eye (S7, or the equivalent, which has its shank rinbedded in the core. The (57 projects into the recess G6 and may be engaged by any suitable tool when the core is to be withdrawn from molded body 27 after the molding or casting operation. l preferably provide the core (Sil 'with an inwardly projecting flange or tongue (i8 which arranged in the recess (itl (sce Figs. 1 and Zl).

As best illustrated in Fig. 5, the mold in which the body 27 is molded preferably comprises upper and .lower molding blocks or plates and 71, respectively. Secured in any suitable manner to the molding blocks or plates 70 and 7l are mol/fling nembers 72 and 73, respectively, whi ch are preferably formed from material substant f identical with the material from Whic ne core (Sil is formed. The incidir r 7 and 73 rooperate t. ith the nousi 22 to proide a mold cavity 75, it be laders ood that each housing meu'iber 22 n'xployeffl in only one molding operation and Vthat when the molded body 27 has been formed therein, the housing member remains perinanentlj.r secured thereto. The molding members 72 and 73 are preferably formed with substann. ab

tially cylindrical surfaces 77 and 78', respectively, which are adapted to fit snugly Within the interior cylindrical surface of each brousingmember 22. The housing member 72: is provided with a molding surface 80 adapted to shape the rear surfaces of the molded members 27 and the member 73 is preferably provi-ded with a molding surface 82. adapted to form the front surfaces or faces of the molded members 27 As best illustrated in F igs'.4and 5, the member 73 is preferably provided with a relatively large integralv extension or lug adapted to form the mouths or larger openings of the sound passages 45, the extension or lug 85 being preferablyprovided With an integral lug 87 adapted to fit snugly Within the recess 66 of the core 64. The lug 87 is preferably provided with a groove 88 adapted to accommodate the flange or tongue 68. When', as hereinafter eX- plaifned, the core 64 is assembled with the member 7 3, the recess 66 in the lar er end. of the core is pushed over the lug 8. in such manner that' the flange or tongue 68 seats in the groove 88 and thereby secures the core to the extension or lug 85. It Will be noted that the lug 87 is provided With a'recess 9 which is adapted to receive the eye 67.

During the molding or casting operation the aforementioned nipple 47 is held in place in the mold cavity 75 by means preferably comprising a tubular member 92 which projects through the member 7 3. and is provided with screw-threads at its inner end `adapted .lo engage the screw-threads formed in the bore 49 of the nipple. The outer end of the tubular member 92 projects into a recess 93 formed in the bottom surface of the molding block or plate 71 andl is provided with a handle member 94 whereby the tubular'mem'- ber may be rotated to unscrew it from. the' nipple. In the preferred embodiments of the invention, a tube 96 preferably extends through the member 73 and provides a per` manent passage through Which the tubularV member 92 may be passed to have its screwthreaded end engage the nipple.' The tube 96 is embedded in the member 73 and is rnot readily removable therefrom. It will be noted that the tube 96 is provided With an annular flange 98 at its inner end which forms part of the surface of the mold cavity 75.

Inr Fig. 12 I have illustrated apparatus which I employ during the molding operations to embed the nuts 32 in the molded bodies 27. As shown, I provide a bolt 102 adapte-d to be screw-threaded into the nuts 32 and adapted to hold the Washers 37 Carried by the shank of the bolt 102 are one orimore Washers 103 and a flexible Washer or flex,n ible tubular member 105 whichy preferably tits loosely upon the shank of the bolt 102 andis adapted to be clampedbetween the washers 103 and the outer surface of the housing member 22. The arrangement is such that if during the molding operation any of the molding material flows out of the housing` member 221 by Way of the apertures3i5, it will collect, within the tubular member 105 and will not How out upon the support upon which the molding apparatus is. positioned asv the tubular member 105 may be sufficiently compressed tol form a liquid tight joint with theV tubular member 22 and With the Washer 103 engaged by it. The Washer or tubular member 105 is preferably formed from rubber, or the equivalent.

Vhen a molded body 27 is to be formedin the above described molding apparatus, the operation is substantially as follows: The tubular member 92 .is passed through the tube 96 and a nipple 47 is secured to its screw-threaded end in the manner illustrated in Fig- 5. The molding block or plate 71 and the molding member 73 carried thereby are then positioned upon any suitable support. The bolt 102, the Washers 1031 and the tubular member 105v are then employed to secure a nut 32 and a Washer 37 to a housing Imember 22 which is then positioned upon the member 72 as illustrated in. 5. Then, after greasing the core 64, I

preferably Wind one or more springs 62,

around it in: the manner illustrated in Figs. 3 and 4, it being readily understood that a relatively long' spring 62 or a plurality of shorter .springs 62 may be employe-d as desired. The core 63 is then positioned upon the member 73 in such manner that the lug 87 projects into the recess 66 and the flange or tongue 68 projects into the groove 88. In some instances I Wind the r.spring 62 around the core after it has been assembled with the member 73. Then, as illustrated in Fig. 4, I

coil the flexible core 64 in such manner thaty the smaller end thereofl may b-e introduced into th-e bore 48 formed in the nipple 47. Of course, the lugs or fingers 57 serve as guides when the small end of the core is inserted in the bore 48 and also prevent lateral displacement thereof if it is accidentally Withdrawn a short distance from the bore. It will be noted that the spring 62 spaces the core 64 from the interior cylindrical surface of the housing member 22r and that it spaces the super-imposed turns of the core from each other, so that after the molded member 27 has been formed, one turn of the sound passage 45 Will not communicate With another turn thereof through the wall which separates them. Obviously, the helical spring 62 permits the molding material to 110W freely around the core 64 and becomes embedded in the molding material when it sets. It may be mentioned at this point in the description that I preferably form the molded members 27 from molding plaster or some equivalent or similar material.

After the core 64 has been properly arranged Within the housing member 22, the

trated iu Fig. Any excess of molding material llores up through one or more risers lOO which entend through the member 72 aud the molding plate 70. Bitter the molding mate il is set, the molding apparatus is turned over so that the molding plate or block rests upon the support, thus permitting the tubular niemlfer l2 to be rotated to disengage it from the nipple il?. The molding plate or bloclc "3 are then lifted l and the member 1 `trom tl.U remaining molding apparatus and the eye lli' is engaged by any suitable tool (not shown) and the flexible core G/-l is Withdrawn 'from the newly formed molded body 27. In the next step et the molding operation, the operator removes the molding plate or blocl: 70 and the member T2 from the housing member 22 and unscrews the bolt l02 so that the tubular member 105 and the Washers 103 may be removed 'from the homing member 22. Each housing member with its associated molded member 2T then assembled with a reproducing unit 52 and with base 2l in the manner illustrated in Figs. lO, ll and 18.

l-laving thus described my invention, it is obvious that various in'nnaterial modifications may made in the same Without departing Yfrom the spirit ol.E my invention; hence 'I do not Wish to be understood as limiting myself to the exact iorm, construction, arrangement and combination of parts herein shown and deseribed or uses mentioned.

1What 1' claim new and desire to secure by Letters Patent is:

l. rin amplifying horn comprising a massive-litre meniber having passage therein, means forming a chamber directly in :liront ol. outlet uid of said i,yassage, and a repre ueing unn disposed in said chamber and eonnnunicatingj with the inlet end of said sound passage 2. An an n jing horn comprising a tubular housing, a member provided with a sound passage theretln'ougl and mounted .d housn a cover one end of d housing,

arranged coni- `aid sound `iosed ia said (over zuid member b to devif a chamber within s miur tat-ing with the outlr passage, and a reproduf said chamber and communieating it .d o t said sound passage.

.fin anu,=.. 'noi-n. com a: hmifdng, covo s i et the housa body member :an l ly lit-ted Within and the contines oli the housing pro- .in a passage therethrough, a reproduc, ig u; n mounted in said housg andV communicating with one end oi the a tubu- Je endn i sound passage.

d. An aniplilying horn comprising a tubusound passage, a base, and means project# ing through the housing 'tor connecting said member to said base.

An amplifying horn comprising a one piece, integral, and massive-like member pr vided with a sound passage hav ug a convolution therein, the inlet and outlet ends ot' said passage being disposed adjacent each other on the same end of said member, and a 1'e.- producing unit positioned at said inlet end and communicating with said sound passage.

7. An amplifying horn comprising a tubular housing, a body member disposed in said housing and provided with a curved sound passage having more than one complete turn through 3G00, a reproducing unit carried by said member and communicating 'with one end ot said sound passage, and closure devices 'for the ends of the tubular housing, said body member connecting the turns constituting the sound passage.

8. An amplifying horn comprising a tubular housing, a member disposed in said housing and provided with a curved sound passage therethrough, both ends of said sound passage opening into the same end of said member, a reproducing unit carried by said member and communicating with one end of said sound passage, and detachable closure devices for the ends of said tubular member.

9. An amplifying horn comprising a tubular housinO, a member disposed i said housing and Iorming partition transversely thereof, said member being provided with a coiled sound passage having at least one complete turn therein, and a reproducing unit disposed in said housing and communicating with one end oi' said sound passage.

10. An ampliiiying horn comprising a member having a convoluted sound passage therein, said sound passage having an inlet end and a discharge end, the inlet end of said sound passage passing through said convolution, and a reproducing unit con'nnunieating with said sound passage and disposed to open in substantially the same direction as said discharge end.

11. Ain amplifying horn comprising a housing formed oi a tube of sheet metal, a body member mounted Within said housing and having a tortuous sound passage therein, a metallic cap closing` one end of the housing member and a metallic annulus seated upon the ladjacent end of the housin member having a foraminous element carried thereby.

12. An amplifying horn of the character described comprising a shell element having fabody member therein vprovided with a helically coiled sound passage liavingat least fone complete turn, one end of the passage extending horizontally between the turn of the sound passage and a reproducing element associated with the extremity of one end of the passage.

i l13. An amplifying horn comprising a body member having a suitable base for supporting the same, said body member having formed therein at least one vertically ydisposed convolution of tapering formation constituting the'sound passage, lone end of the sound passage being substantially horizontally ldisposedand extending through the convoluted sound passage aforesaid, and a rcproducing element associated with the passage. y

14. An amplifying horn comprising a body element having formed therein a sound passage comprising a plurality of vertically disposed convolutions ofhelical formation, a web extending between the turns of the passage, a reproducing element associated with the passage, an end device closing one end of the body element and a separate end device closing the adjacent end of the body.

15. An amplifying horn of the character described, Vcomprising a base, a tubular body portion associated with the base and supported thereby, said body portion having formed therein a plurality of vertically disposed convolutions constituting a tortuous sound passage of relatively long character within the relatively small space provided by said body portion, one end of theL sound passage extending through the convolutions, said body portion having a weby extending between the turns of the convolutions of substantially concavo-convex formation.

16. An amplifying horn comprising a base, a body portion mounted on the base having a vsound passage of convoluted formation therein and of substantially vertical disposition with respect to the base, the sound passage having inlet and outlet ends disposed adjacent each other on the same side of the body portion, a reproducing unit positioned at the inlet of the sound passage and communicating therewith, a web of irregular formation joining the said convolutions, an end cap secured to one side of the body portion and an end device having a foraminated element secured to the adjacent side thereof.

17. An amplifying horn comprising a body member having formed near the peripheral edge thereof, a convoluted sound passage connected by a web portion of the body member, one end of the sound passage passing through the aforesaid convolutions, and a reproducing unit communicating with said sound passage.

` 18. An amplifying 'horn comprising an integral body member having `a convoluted sound passage therein of substantially vertical disposition, the convoluted portion bei-ng joined and made integral with the material of the body member, one end -of the sound reproducing unit passing through said lconvolution and discharging from one side of the body member, `and the other end of the convolution discharging from the same side in close proximity to the first-named end, and a reproducing unit communicating with one of the ends of the sound passage.

19. An amplifying horn comprising a..

producing unit isposed in said chamber-and communicating with the inlet end of the sound assage.

20. n amplifying 'horn comprising a housing and a member positioned in said housing and forming a Wall extending transversely thereof, said member being provided with a substantially helical sound passage having atleast one complete turn therein.

21. An amplifying horn comprising a member having a substantially helical sound passage therein of more than one complete turn, transversely disposed means forl connecting the turn constituting the passage and a reproducing unit communicating with oneV end of the `sound passage.

22. An amplifying horncomprising a tubular member, closure members for the ends of said tubular member, oneof said closure members having a foraminous wall therefor, a i

massive-like body member fixed in `said tubular member and provided with a sound passage and a reproducingv unit carried by the sound passage member and communicating with one end of the Vsound passage.

23. An amplifying lhorn comprising a transversely disposed body member, having a -tortuous sound passage therein, a reproducing unit carried by the body member and communicating with one end of -the sound passage, said body member being recessed in `one `side thereof to define a chamber communicating with the outlet of the passage.

24. An amplifying horn having a tubular housing, a body member of lconsiderable Width transversely disposed Within-the housing and provided with a convoluted sound passageway near the periphery thereof, said body member constituting a partition joining the convolutions constituting the sound passage, a reproducing vunit carried by the body member and communicating with one end of said sound passage.

25. An amplifying horn having a tubular housing, .a body member of considerable lGO Width transversely disposed Within the housing and provided with convoluted sound passageway near the periphery thereof, said body member constituting a partition joining the convolutions constituting the sound passage, a reproducing unit carried by the body member and communicatingl with one end ol said sound passage, said body member being provided with a cup-like recess in at least one side the reoif constituting a chamber communicating with the outlet end oi' the passage.

2G. An amplifying horn including a body member of wavy-like formation to provide a chamber in at least one side thereof, said body member having vertically disposed convolution ot tapered formation located in substantially the circumferential periphery thereof, the convolutions or which are conne d by the body member, one end of the pa e extending through the aforesaid cong volu'f ion and the other end terminating in the saine side of the body member and com municating with the said chamber, an end device secured to the body member and closing the said chamber.

27. An amplifying horn ol the character described, comprising a tubular shell, a support therefor, a body portion of considerable width disposed Within the shell and provided With a sound passage having at least one convolution, the material of the body portion connecting the convolution afore said.I an amplifying unit connected with the inlet end oi' the sound passage and a closure device attached to the shell concealing the said reproducing; unit.

28. An amplifying horn of the character described comprising a body member having at least one convolution formed therein near the circumEereLjal periphery thereof constitutingl a sound passage, said body member having a connecting Web-like portion joining the convolution, the inlet end of the sound iassage being horizontally disposed With respect to the body portion and provided With a reproducing unit, and the outlet end of the sound passage discharging from the same side oi. the body in close proximity to the inlet thereof.

29. .An amplilyinfr horn comprising ay tubular shell, a body member located Within and supporting said shell, said body member being` shaped to l'orm a chamber in at least one side thereoii, a helical sound passage formed in the body having its outlet terminating in the chamber provided in one side thereof, and a reproducing unit cooperatiifely secured to the body portion in communication with the inlet of the sound passage, and a cover detachably secured to the tubular shell for closing the chamber and rendering the reproducing unit accessible upon the removal of the cover.

30. An amplifying horn comprising a housing member having a plurality of Walls including a foraminous Wall, a massive-like body member disposed in said housing and provided With a tortuous sound passage having an inlet end and an outlet end both opening toward said oraminous Wall, and a reproducing unit communicating with said inlet end.

3l. An amplifying horn comprising a massive body member having a helically coiled sound passage therein olf more than one turn, said body member forming the Walls of said sound passage, and a reproducing unit carried by said member and communicating with one end of said sound passage.

ln testimony whereof, I have hereunto signed my name. y

FRED lV. TEMPLE. 

